Cannot create index whose evaluation cannot be enforced to remote nodes

testdb=> create unique index "rule_test_1" on "public"."test_1" using btree("xh");
ERROR:  Cannot create index whose evaluation cannot be enforced to remote nodes
testdb=>

testdb=> \d+ public.test_1
                                Table "public.test_1"
 Column |          Type          | Modifiers | Storage  | Stats target | Description
--------+------------------------+-----------+----------+--------------+-------------
 id     | integer                | not null  | plain    |              |
 xh     | character varying(128) |           | extended |              |
Indexes:
    "test_1_pkey" PRIMARY KEY, btree (id) TABLESPACE pg_default
Has OIDs: no
Distribute By: HASH(id)
Location Nodes: ALL DATANODES
Options: orientation=row, compression=no

testdb=>  create unique index "rule_test_1" on "public"."test_1" using btree("xh","id");
CREATE INDEX

testdb=> \d+ public.test_1
                                Table "public.test_1"
 Column |          Type          | Modifiers | Storage  | Stats target | Description
--------+------------------------+-----------+----------+--------------+-------------
 id     | integer                | not null  | plain    |              |
 xh     | character varying(128) |           | extended |              |
Indexes:
    "test_1_pkey" PRIMARY KEY, btree (id) TABLESPACE pg_default
    "rule_test_1" UNIQUE, btree (xh, id) TABLESPACE pg_default
Has OIDs: no
Distribute By: HASH(id)
Location Nodes: ALL DATANODES
Options: orientation=row, compression=no

testdb=> select * from test_1
testdb-> ;
 id | xh
----+-----
  2 | 1s
  1 | 2s
(2 rows)

testdb=> insert into test_1 values(3,'dd');
INSERT 0 1
testdb=> insert into test_1 values(4,'dd');
INSERT 0 1
testdb=> insert into test_1 values(5,'dd');
INSERT 0 1
testdb=>
testdb=> select * from test_1;
 id | xh
----+-----
  1 | 2s
  5 | dd
  3 | dd
  2 | 1s
  4 | dd
  5 | dd
(6 rows)

testdb=> create table tablename(id int,xh character(50)) DISTRIBUTE BY HASH(xh);